RESLEVEL and channel initiator connections

By default, when an API-resource security check is made by the channel initiator, two user IDs are checked to see if access is allowed to the resource.

The user IDs checked can be that specified by the MCAUSER channel attribute, that received from the network, that of the channel initiator address space, or the alternate user ID for the message descriptor. This depends on the communication protocol you are using and the setting of the PUTAUT channel attribute. See User IDs used by the channel initiator for more information.